Short answers, pulled from the story.
Napoleon launched his troops after the beaten Allies at 9:00 am on the 12th of February. Marshal Édouard Mortier commanded the pursuit on the main highway while Napoleon personally led another column farther west through Rozoy. The French emperor ordered MacDonald to seize the bridge at Château-Thierry.
Napoleon faced Blücher and his generals with Marshals Claude Perrin Victor, Nicolas Oudinot, Jacques MacDonald, and Édouard Mortier leading French forces. Allied commanders included Russian General Michael Andreas Barclay de Tolly, Prussian field marshal Blücher, and corps leaders such as Yorck, Sacken, Kaptzevich, and Kleist.
The battle occurred on the 12th of February 1814 when Napoleon launched his troops after the beaten Allies at 9:00 am. By the time his 400 soldiers fought their way to the bridge, it had been destroyed and they were compelled to surrender.
Historians David G. Chandler and Francis Loraine Petre stated that the Prussians had 1,250 casualties while the Russians suffered 1,500 losses and the French lost 600 men. Other authorities put French losses at 400 or 600, with Prussian killed and wounded numbering 22 officers and 1,229 enlisted men.
Napoleon was extremely disappointed that he had failed to destroy Sacken and Yorck because the failure to annihilate the Allied corps left them intact enough to fight again. Blücher advanced to attack Napoleon with two more corps, leading directly to the subsequent Battle of Vauchamps on the 14th of February.